JP5194292B2 - Lens mount for board camera - Google Patents

Description

  The present invention relates to a lens mount for a board camera to which a board camera lens is attached.

  A schematic cross-sectional view of a conventional typical board camera lens mount is shown in FIG. A CCD sensor 12 is placed on a printed circuit board (PCB) 10 on which an electronic circuit is printed. A substantially cylindrical mount frame (camera mount) 14 surrounding the CCD sensor 12 is fixed on the substrate 10. A lower portion 16 a of the lens frame 16 that holds the lens 20 is inserted inside the mount frame 14, while a top portion of the mount frame 14 is supported by a flange portion 16 b of the lens frame 16. The mount frame 14 is provided with one to three screw holes 18. A set screw (not shown) to be screwed into the screw hole 18 is screwed into the mount frame 14 so that the lower end 16a of the lens frame is directed inward. The lens frame 16 is fixed thereby.

  In this conventional board camera lens mount, when the number of the screw holes 18 is one, the lower 16a of the lens frame is pressed from one direction, so that the lens frame 16 is tilted and the optical axis is shifted. Furthermore, the perpendicularity between the lens optical axis and the sensor surface is not maintained, and so-called “optical axis collapse” occurs. When the optical axis shift or the optical axis tilt occurs, one-sided blur occurs and the image performance is adversely affected. Even when the screw holes 18 are arranged at equal intervals and fixed with a plurality of set screws at equal intervals, the screwing of the set screws is a manual operation, so that the screwing is uneven and the optical axis misalignment and light Axis collapse occurs.

  Further, as shown in FIG. 4, a part of the mount frame 14 is notched to form a slit portion, and a wide portion is provided at the position of the slit portion, and one screw hole 22 penetrating this wide portion is provided. A board camera lens mount is also known in which a tightening screw is screwed to tighten and deform the mount frame, thereby fixing the lower portion 16a of the lens frame. According to this, it is possible to fix with one tightening screw.

  However, in this board camera lens mount, the vicinity of the slit portion is strongly tightened, and it is difficult to uniformly tighten the entire circumference, and the above-described problems of optical axis misalignment and optical axis tilting occur.

JP 2000-125162 A

  An object of the present invention is to provide a lens mount for a board camera in which the lower part of the lens frame can be uniformly tightened by a simple operation, thereby preventing problems of optical axis misalignment and optical axis tilting. .

  As a result of diligent research, the inventor of the present application divided at least the upper part of the mount frame into a plurality of parts, cut a male screw on the outer periphery of a part of the mount frame, and provided a lens tightening ring to be screwed to the lens. Tapered parts that abut each other on the inner side of the attachment ring and the outer side of the upper part of the mount frame, and by screwing the lens fastening ring downward, the taper part of the mount frame is pressed inward, and the mount frame is deformed thereby. By adopting a configuration that tightens the lower part of the lens frame, it is possible to evenly tighten the lower part of the lens frame from a plurality of directions by an extremely simple operation of rotating the lens tightening ring. The present invention was completed by conceiving that the problem of falling could be avoided.

That is, the present invention includes a substrate, a basically cylindrical mounting frame fixed on the substrate, and a lens fastening ring that is screwed to the outer periphery of the mounting frame. , At least an end thereof is divided into a plurality of regions, and all or a part of the plurality of regions constitutes a lens fastening portion, and the plurality of lens fastening portions are arranged at equal intervals. A tapered portion having a larger diameter on the substrate side is formed on the outer side of the end portion, and a tapered portion that is in contact with the tapered portion is formed on the inner side of the lens fastening ring. When the fastening ring is rotated and moved to the substrate side, the taper portion of the lens fastening portion is pressed inward by the taper portion of the lens fastening ring, and the mount frame is deformed, and the plurality of regions Part of the lens tightening The other area is a flange back (FB) adjustment ring mounting part that is farther from the substrate than the lens tightening part, and the FB adjustment screwed to the outer periphery of the FB adjustment ring mounting part Provided is a board camera lens mount further comprising a ring .

  According to the lens mount for a board camera of the present invention, the lower part of the lens frame can be evenly tightened from a plurality of directions by a very simple operation of rotating the lens tightening ring, whereby the optical axis shift and the optical axis The problem of falling can be avoided. Furthermore, the lens mount of the present invention can be provided with three functions of flange back adjustment, optical axis alignment, and mount tightening at one time by a single member called a lens mount on the camera side. It is advantageous.

(A) is a cross-sectional view of a preferred embodiment of a lens mount for a board camera of the present invention, (B) is a plan view depicting a pedestal, and (A) is a cross-sectional view along line AA ′ of (B). FIG. FIG. 2 is a plan view of a mount frame of a preferred embodiment of the board mount for a board camera of the present invention. It is a schematic cross section of the conventional lens mount for board cameras. It is a schematic cross section of the other conventional lens camera lens mount.

Hereinafter, a preferred embodiment of the present invention will be described with reference to the drawings. In this specification, the terms “upper”, “upper”, “lower”, “lower” and the like indicate the upper and lower sides in a state where the substrate is arranged on the lower side and the lens is on the upper side. ing. That is, the top and bottom shown in the cross-sectional view of FIG. Therefore, “upper” is an end, and “lower” and “lower” are substrate sides.

  FIG. 1 shows a preferred embodiment of a lens mount for a board camera according to the present invention. 1B is a plan view showing the pedestal in this embodiment, FIG. 1A is a sectional view of the mount of this embodiment, and is taken along line AA ′ in FIG. It is sectional drawing cut | disconnected. In addition, the same reference number is attached | subjected to the member similar to the above-mentioned prior art example.

  A CCD sensor 12 is mounted on a substrate 10 on which an electronic circuit is printed. A pedestal 24 is detachably fixed on the substrate 10 by a plurality of screws. The pedestal 24 has a substantially square shape as shown in FIG. 1B, but may be any shape as long as the mount frame 14 to be described later can be fixed thereon. The pedestal 24 is provided so that the distance between the lens and the CCD sensor 12 can be changed greatly by exchanging with a pedestal having a different thickness. This is not necessary when producing a product, or when using different types of lenses whose focal length variation is within a narrow range that can be adjusted by an FB adjustment ring, which will be described later. In these cases, the mount frame 14 will be described later. May be directly fixed on the substrate 10.

  The mount frame 14 is fixed on the pedestal 24. The mount frame 14 basically has a cylindrical shape. As described later, “basically cylindrical” means that the mount frame 14 is divided at least at its upper part by a gap to constitute a lens tightening portion and a flange back (FB) adjustment ring mounting portion. Except for this, it means that it has a cylindrical shape as a whole. The mount frame is divided by at least an upper portion thereof, that is, in this embodiment, a gap 26 having a length of about 50% to 70% from the top of the cylinder (the top of the adjustment ring mounting portion (described later)) (see FIG. 2). ). Six vertical gaps 26 are provided at equal intervals, whereby the upper portion of the mount frame 14 is divided into six portions having the same length (length along the circumference). Of the divided portions, three constitute the lens tightening portion 14a, and the remaining three constitute the FB adjustment ring mounting portion 14b. The number of lens tightening portions 14a is not limited to three and can be arbitrarily set, but is usually about 2 to 4. In this example, the number of lens tightening portions 14a and the number of FB adjustment ring mounting portions 14b are the same. The lens tightening portions 14a and the FB adjustment ring mounting portions 14b are alternately arranged. Therefore, the lens tightening portions 14a are disposed at equal intervals. A tapered portion 14a 'having a larger diameter on the lower side is formed on the outer side of the upper end portion of the lens tightening portion 14a. Further, a meat stealing portion 14c is formed under the taper portion 14a '. Therefore, the thickness of the lens tightening portion 14a that supports the taper portion 14a' is thin as shown in FIG. Thus, the upper portion of the lens tightening portion 14a can be easily deformed inward. On the other hand, the FB adjustment ring mounting portion 14b is higher than the lens tightening portion 14a, and an FB adjustment ring 28 (to be described later) is screwed to the outside of the portion protruding from the lens tightening portion 14a.

  A lens fastening ring 30 is screwed onto the outer periphery of the mount frame 14. Inside the lens tightening ring 30, a taper portion 30a that contacts the taper portion 14a 'of the mount frame is formed. When the lens tightening ring 30 is rotated to move the lens tightening ring 30 downward. The taper portion 14a ′ of the lens tightening portion is configured to be deformed by being pressed inward by the taper portion 30a of the lens tightening ring. The lens tightening ring 30 is formed with a protrusion 30b that improves the engagement with the finger, but there is no particular problem if it is not formed. The FB adjustment ring 28 is screwed around the outer periphery of the upper end portion of the FB adjustment ring mounting portion 14b. The FB adjustment ring 28 moves in the vertical direction by rotating.

  When the lens frame is mounted using the lens mount described above, the cylindrical lower portion 16 a of the lens frame 16 is inserted into the mount frame 14. This insertion may be a simple insertion, or may be inserted by screwing screws into the outside of the cylindrical lower portion 16a of the lens frame 16 and the inside of the mount frame 14, respectively. The inner diameter of the cylindrical mount frame 14 is slightly larger than the outer diameter of the cylindrical lower portion 16a of the lens frame 16, but is almost the same as the outer diameter of the lower portion 16a of the lens frame 16 to such an extent that it can be fixed by tightening described later. It has become. The lens frame 16 is inserted until the flange portion 16b is supported in contact with the top of the FB adjustment ring. Here, the FB adjustment ring 28 is rotated, whereby the lens frame 16 is moved up and down to perform focusing. That is, since the flange portion 16b is fixed in contact with the top portion of the FB adjustment ring 28, when the FB adjustment ring 28 is moved downward, the lens frame 16 and the flange portion 16b are also connected to the FB adjustment ring 28. It is moved downward until it abuts on the top of 28. When the focusing is completed, the lens fastening ring 30 is rotated and moved downward. Then, the downward movement of the taper portion 30a of the lens tightening ring 30 causes the taper portion 14a 'of the lens tightening portion to be pressed inward and the upper portion of the lens tightening portion 14a is deformed inward. Thereby, the lower part 16a of the lens frame 16 is pressed by the upper part of the lens fastening part 14a, and is fixed in a focused position. As described above, since the lens tightening portions 14a are arranged at equal intervals and have the same length (length along the circumference), the lower portion 16a of the lens frame 16 can be simultaneously and from three directions. Pressed uniformly. For this reason, optical axis deviation and optical axis collapse do not occur.

  As described above, according to the lens mount for the board camera of the present invention, the optical axis shift and the optical axis tilting can be performed by an extremely simple operation that does not require skill, such as rotating the lens fastening ring 30 and moving it downward. The lens frame 16 can be fixed without waking up.

  In the above embodiment, the FB adjustment ring 28 is provided, and the FB adjustment ring mounting portion 14b is provided for screwing the ring. However, when mass-produced products are produced using the same lens, first, Since the focal length of the lens is known, the FB adjustment ring 28 is unnecessary if the dimensions are designed so that the focusing is achieved. Therefore, the FB adjustment ring mounting portion 14b is also unnecessary. In this case, the upper part of the divided mount frame can be used as the lens fastening portion 14a, and the flange portion 16b of the lens frame 16 is supported on the top of the lens fastening portion 14a.

DESCRIPTION OF SYMBOLS 10 Board | substrate 12 CCD sensor 14 Mount frame 14a Lens fastening part 14b FB adjustment ring mounting part 14c Meat stealing part 16 Lens frame 16a Lower part of lens frame 16b Flange part of lens frame 18 Screw hole 20 Lens 22 Screw hole 24 Base 26 Vertical direction 28 FB adjustment ring 30 Lens tightening ring 30a Taper portion of lens tightening ring 30b Projection of lens tightening ring

Claims (4)

Comprising a substrate, a basically cylindrical mounting frame fixed on the substrate, and a lens fastening ring screwed onto the outer periphery of the mounting frame, the mounting frame having at least an end thereof It is divided into a plurality of regions, and a part of the plurality of regions constitutes a lens tightening portion, and the plurality of lens tightening portions are arranged at equal intervals. A taper portion with a larger diameter is formed, and a taper portion that contacts the taper portion is formed inside the lens tightening ring, and the lens tightening ring is rotated and moved to the substrate side. Then, the taper portion of the lens tightening portion is pressed inward by the taper portion of the lens tightening ring to deform the mount frame, and a part of the plurality of regions constitutes the lens tightening portion. However, the other area is the lens clamping part. Also constitutes a distance is long flange back (FB) adjustment ring mounting portion of the substrate, the FB adjusting ring further comprises a FB adjustment ring screwed into the outer peripheral portion of the mounting portion, screwed been the FB adjusting ring , The distance between the FB adjustment ring and the substrate changes, and the top of the FB adjustment ring comes into contact with the flange portion when the lens frame having the flange portion is inserted into the mount frame. A lens mount for a board camera that supports the lens frame .   The board mount lens mount according to claim 1, wherein the mount frame is fixed to the substrate via a detachable base.   The lens mount for board cameras according to claim 1, wherein 2 to 4 lens fastening portions are formed.   The board mount lens mount according to claim 3, wherein the same number of lens tightening portions and FB ring mounting portions are formed, and 2 to 4 are formed respectively.

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